Luigi Palopoli

Specifying the Dynamics of Complex Object Databases

In this paper, a rule-based language for specifying the evolution of a complex object database is defined. Several update operators are introduced, which correspond to basic manipulations of data entities with object identity. These operators can be used in rules bodies for specifying complex update transactions. The syntax and the semantics of the language is given with reference to a simple data model for complex objects with identity. The issues of integrity constraints maintenance and language expressibility is also discussed.

Modeling database applications using generalized production rules

Presents a rule language with an event based semantics that naturally embeds the behaviour of both active rules and deductive rules and conditional update streams. The language has a quite general data model that allows the definition of both flat and structured data. Language syntax and semantics are formally defined. An interpreter then illustrated. By using several examples, the authors show that this language allows various forms of data manipulations to be expressed as well as quite general triggering computations.<<ETX>>